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Film Capacitors

Film capacitors, also known as film dielectric capacitors, polyester capacitors or plastic film capacitors, are surface mount capacitors which are constructed with a metallized plastic film as the dielectric with electrodes on both sides of the film. Commonly used dielectric films are polyester, polypropylene and polystyrene making the components miniaturized and suitable for automated placement in modern electronic equipment and processes. Film capacitors can be used in applications requiring higher frequency and stability than traditional electrolytic capacitors.

BFC233868421 - Application Field and Working Principle

The BFC233868421 is a film capacitor specifically designed for power-supply applications. It features a high temperature rating, low ESL and low ESR. These features make the BFC233868421 ideal for applications such as power supplies, UPS systems, multi-phase converters, adjustable speed drives and various SMPS. Film capacitors are widely used as snubbers, decoupling and energy storage applications.

The working principle of the BFC233868421 is based on the static capacitance of a dielectric material between two conductors. This static capacitance can be defined as the ratio of the charge stored between the two conductors to the voltage applied across them. In the case of film capacitors, the dielectric material is a metallized plastic film with electrodes on both sides of the film.

When current flows through the BFC233868421, the current flow is not continuous but is rather interrupted in such a way that the current is stored in the dielectric film and then released gradually. This process of storing and releasing energy is what is known as capacitance and is what allows the BFC233868421 to act as a filter in power supply applications. This filtering reduces the amount of ripple and noise in the power circuit.

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